Nat Goodspeed wrote:

...

Maybe this shouldn't be a BOOST_FOREACH feature at all. As with Python's builtin enumerate() function, maybe what we want here is an iterator adapter that dereferences to a std::pair original_iterator_value_type>?

Couldn't you just do a BOOST_FOREACH over combine(count_range(), foos) for that? (uses zip_iterator)

Yup, Nat's idea is a nice one and easy to implement. As Eric alluded to with his reference to the ticket on FOREACH_FIELD, the heart of the matter really though is getting a syntactically convenient version. We've seen this situation - where we have the neat iterators/ranges but not the syntactic convenience - a few times (REVERSE_FOREACH, FOREACH_FIELD, this "FOREACH_WITHINDEX" spring to mind) - I wonder if there is an opportunity to expose a lower level API in the FOREACH mini-library that would enable advanced users to build such macros themselves.